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149a56946f
I've built some tests in WebRTC with and without this change. With this change number of __tsan_read/write calls is reduced by 20-40%, binary size decreases by 5-10% and execution time drops by ~5%. For example: $ ls -l old/modules_unittests new/modules_unittests -rwxr-x--- 1 dvyukov 41708976 Jan 20 18:35 old/modules_unittests -rwxr-x--- 1 dvyukov 38294008 Jan 20 18:29 new/modules_unittests $ objdump -d old/modules_unittests | egrep "callq.*__tsan_(read|write|unaligned)" | wc -l 239871 $ objdump -d new/modules_unittests | egrep "callq.*__tsan_(read|write|unaligned)" | wc -l 148365 http://reviews.llvm.org/D7069 llvm-svn: 228917
92 lines
2.3 KiB
LLVM
92 lines
2.3 KiB
LLVM
; RUN: opt < %s -tsan -S | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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declare void @escape(i32*)
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@sink = global i32* null, align 4
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define void @captured0() nounwind uwtable sanitize_thread {
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entry:
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%ptr = alloca i32, align 4
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; escapes due to call
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call void @escape(i32* %ptr)
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store i32 42, i32* %ptr, align 4
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ret void
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}
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; CHECK-LABEL: define void @captured0
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; CHECK: __tsan_write
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; CHECK: ret void
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define void @captured1() nounwind uwtable sanitize_thread {
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entry:
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%ptr = alloca i32, align 4
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; escapes due to store into global
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store i32* %ptr, i32** @sink, align 8
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store i32 42, i32* %ptr, align 4
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ret void
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}
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; CHECK-LABEL: define void @captured1
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; CHECK: __tsan_write
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; CHECK: __tsan_write
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; CHECK: ret void
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define void @captured2() nounwind uwtable sanitize_thread {
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entry:
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%ptr = alloca i32, align 4
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%tmp = alloca i32*, align 8
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; transitive escape
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store i32* %ptr, i32** %tmp, align 8
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%0 = load i32** %tmp, align 8
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store i32* %0, i32** @sink, align 8
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store i32 42, i32* %ptr, align 4
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ret void
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}
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; CHECK-LABEL: define void @captured2
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; CHECK: __tsan_write
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; CHECK: __tsan_write
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; CHECK: ret void
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define void @notcaptured0() nounwind uwtable sanitize_thread {
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entry:
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%ptr = alloca i32, align 4
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store i32 42, i32* %ptr, align 4
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; escapes due to call
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call void @escape(i32* %ptr)
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ret void
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}
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; CHECK-LABEL: define void @notcaptured0
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; CHECK: __tsan_write
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; CHECK: ret void
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define void @notcaptured1() nounwind uwtable sanitize_thread {
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entry:
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%ptr = alloca i32, align 4
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store i32 42, i32* %ptr, align 4
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; escapes due to store into global
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store i32* %ptr, i32** @sink, align 8
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ret void
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}
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; CHECK-LABEL: define void @notcaptured1
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; CHECK: __tsan_write
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; CHECK: __tsan_write
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; CHECK: ret void
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define void @notcaptured2() nounwind uwtable sanitize_thread {
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entry:
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%ptr = alloca i32, align 4
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%tmp = alloca i32*, align 8
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store i32 42, i32* %ptr, align 4
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; transitive escape
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store i32* %ptr, i32** %tmp, align 8
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%0 = load i32** %tmp, align 8
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store i32* %0, i32** @sink, align 8
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ret void
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}
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; CHECK-LABEL: define void @notcaptured2
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; CHECK: __tsan_write
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; CHECK: __tsan_write
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; CHECK: ret void
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